JP2008038893A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hermetic compressor capable of saving manufacturing costs, and capable of improving efficiency by reducing weight of weight balances installed on a rotor. <P>SOLUTION: The hermetic compressor is provided with a stator, the rotor rotating while electrically interacting with the stator, a rotary shaft pressed in the rotator and rotating with the rotator, an eccentric part formed on one end of the rotary shaft to carry out eccentric rotation in accordance with rotation of the rotary shaft, a plurality of weight balances installed on the rotor so as to prevent eccentric rotation of the rotary shaft due to the eccentric part, and a separation member separating the plurality of the weight balances from the rotor. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hermetic compressor, and more particularly, can reduce manufacturing costs and increase the efficiency of a compressor by changing a weight balance coupling structure coupled to a rotor. The present invention relates to a hermetic compressor.

  Generally, a hermetic compressor includes a hermetic container that forms a hermetic space, a compressor that is provided inside the hermetic container and compresses refrigerant sucked into the hermetic container, and a drive for driving the compressor. An apparatus.

  The compression device includes a cylinder that forms a compression chamber in which refrigerant is compressed, a piston that compresses the refrigerant while reciprocating linearly inside the compression chamber, and a cylinder that is coupled to one side of the cylinder so as to seal the compression chamber And a head, and the refrigerant sucked into the compression chamber is compressed and then discharged.

  The driving device provides a driving force to the compression device as described above. The driving device is fixed to the inside of the hermetic container, and is installed on the inner side of the stator so as to be separated from the stator. And a rotor that interacts with each other, and the whole functions as one motor.

  As shown in FIG. 1, a rotary shaft 2 is press-fitted and inserted into a central portion of the rotor 1, and an eccentric portion 2 a that rotates eccentrically is formed at one end of the rotary shaft 2, and between the eccentric portion 2 a and the piston 4. Is provided with a connecting rod 3 for switching the eccentric rotational motion of the eccentric portion 2 a to the linear reciprocating motion of the piston 4.

  When the rotor 1 rotates in such a hermetic compressor, centrifugal force is generated in the eccentric portion 2a and the connecting rod 3 around the rotating shaft 2, and inertia force is generated in the connecting rod 3 and the piston 4, respectively. When the rotor 1 rotates, the rotating shaft 2 rotates eccentrically due to the forces generated in the eccentric portion 2a, the connecting rod 3, and the piston 4, respectively. In order to compensate for the eccentric rotation of the rotating shaft 2, the rotor A lower weight balance 6 is installed in the lower part of 1 in the direction opposite to the eccentric part 2a with the rotating shaft 2 as the center.

  However, since the centrifugal force generated by the lower weight balance 6 does not act on the reference axis O on which the centrifugal force generated by the eccentric portion 2a and the connecting rod 3 and the inertial force generated by the connecting rod 3 and the piston 4 act, the lower weight When the balance 6 is installed, a moment is generated.

  In order to compensate for the moment generated by installing the lower weight balance 6 in this way, the upper weight balance 5 is installed on the upper side of the rotor 1 in the opposite direction of the lower weight balance 6 around the rotating shaft 2. The In this case, since the upper weight balance 5 is further away from the reference axis O than the lower weight balance 6, the weight of the upper weight balance 5 is made smaller than the weight of the lower weight balance 6.

  When the weight balances 5 and 6 are coupled to the rotor 1, the rivet 7 having the locking projection 7a formed at one end is passed through the rotor 1 and the weight balances 5 and 6, and The weight balances 5 and 6 are coupled to the rotor 1 by caulking the end opposite to the side where the stop protrusion 7a is formed.

  In order to prevent the rotating shaft 2 from rotating eccentrically, the forces acting on the rotating shaft 2 must be balanced. Centrifugal force due to the eccentric portion 2a and the connecting rod 3 is A, inertial force due to the connecting rod 3 and the piston 4 is B, among the forces acting on the rotary shaft 2, the centrifugal force due to the upper weight balance 5 is C, and centrifugal force due to the lower weight balance 6 When the force is D, the following equation must hold:

A + B + C = D (1)
Further, the forces A, B, C, and D do not work on the same axis, and moments are generated by the forces. However, in order to prevent the rotating shaft 2 from rotating eccentrically, the forces A, B, C, and D are used. The sum of moments must be zero.

  Since the forces A and B work on the reference axis O, the moment values due to the forces A and B with respect to the reference axis O are zero.

  However, since the force C and the force D are separated from the reference axis O, a moment is generated. When the distance from the reference axis O to the force C is L1, and the distance from the reference axis O to the force D is L2, the following equation must be established.

C × L1 = D × L2 (2)
However, in the conventional hermetic compressor, since the upper weight balance 5 and the lower weight balance 6 are installed in close contact with the rotor 1 via the rivets 7, it is impossible to adjust L1 and L2. Therefore, the weights of the upper weight balance 5 and the lower weight balance 6 cannot be arbitrarily set, and the upper weight balance 5 and the lower weight balance 6 are set so as to satisfy the above expressions (1) and (2) at the same time. Weight has been determined.

  However, since the weights of the upper weight balance 5 and the lower weight balance 6 set so as to satisfy the expressions (1) and (2) at the same time are heavy, there is a problem that the production of the weight balance is expensive. .

  In addition, since a heavy weight balance is attached to the rotor, there is a problem that the electric power required for the operation of the compressor increases and the efficiency of the compressor decreases.

  The present invention is for solving the above-mentioned problems, and its purpose is to reduce the weight of the weight balance provided in the rotor to prevent the eccentric rotation of the rotating shaft, thereby reducing the manufacturing cost of the compressor. It is an object of the present invention to provide a hermetic compressor capable of saving and increasing the efficiency of the compressor.

  The hermetic compressor according to the present invention that achieves the above object includes a stator, a rotor that rotates in electrical interaction with the stator, and a rotation that is press-fitted into the rotor and rotates together with the rotor. A shaft, an eccentric part formed at one end of the rotary shaft so as to rotate eccentrically according to the rotation of the rotary shaft, and the rotor installed so as to prevent the rotary shaft from rotating eccentrically by the eccentric part A plurality of weight balances, and a separating member that separates the plurality of weight balances from the rotor.

The hermetic compressor further includes a rivet for fixing the plurality of weight balances to the rotor, and the separating member is formed integrally with the rivet.
The separating member has a predetermined height so that the rotating member is separated from the weight balances.
In addition, the separation member includes a plurality of locking protrusions provided at a predetermined distance from each other so that the rotating member and the weight balances are separated from each other.
Further, the rivet includes a first penetrating portion extending from one side of the separating member and penetrating the rotor, and a second penetrating portion extending from the other side of the separating member and penetrating each weight balance. Prepare.

The weight balance is fixed to the rotor by caulking both end portions of the rivet.
Further, the separation member is formed so as to project a predetermined height from either the upper surface or the lower surface of each weight balance.
Further, the weight of the weight balance provided far from the eccentric part is smaller than the weight of the weight balance provided near the eccentric part.

  According to the hermetic compressor according to the present invention, since the weight balance is installed at a predetermined distance from the rotor, the weight of the weight balance can be reduced.

  By reducing the weight of the weight balance in this way, the weight balance manufacturing cost can be reduced, and the electric power required for the operation of the compressor can be reduced, so that the efficiency of the compressor can be increased.

  Hereinafter, preferred embodiments of a hermetic compressor according to the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 2, the hermetic compressor according to one embodiment of the present invention is provided with a hermetic container 10, a compressor 20 that compresses a refrigerant, and a driving force applied to the compressor 20. And a drive device 30 for providing

  One side and the other side of the sealed container 10 are compressed inside the sealed container 10 by the suction pipe 11 that guides the low-pressure refrigerant that has passed through the evaporator of the refrigeration cycle to the inside of the sealed container 10 and the compression device 20. And a discharge pipe 12 for guiding the high-pressure refrigerant to the condenser of the refrigeration cycle.

  The compression device 20 is formed integrally with the frame 15, and includes a cylinder 21 that forms a compression chamber 21a in which a refrigerant is compressed, a piston 22 that is installed so as to be capable of linear reciprocation inside the compression chamber 21a, and a compression chamber 21a. A cylinder head 23, which is coupled to one side of the cylinder 21 so as to be sealed and in which a refrigerant discharge chamber 23 b that communicates with the discharge pipe 12 and a refrigerant suction chamber 23 a that communicates with the suction pipe 11 are mutually formed; And a valve device 24 that is attached between the cylinder head 23 and interrupts the flow of the refrigerant sucked into the compression chamber 21a and the refrigerant discharged from the compression chamber 21a.

  The driving device 30 provides a driving force so that the piston 22 can linearly reciprocate inside the compression chamber 21 a, and is provided inside the stator 31 and a stator 31 fixed to the lower peripheral side of the frame 40. A rotor 32 that rotates by electromagnetic interaction with the stator 31; and a rotary shaft 33 that is press-fitted into the center of the rotor 32 and rotates together with the rotor 32.

  The rotating shaft 33 is rotatably supported by the bearing 13, and the bearing 13 is supported by the frame 15. The lower portion of the rotating shaft 33 extends through the hollow portion 16 formed at the center of the frame 15 to the lower portion of the frame 15, and the lower end of the rotating shaft 33 extending to the lower portion of the frame 40 is An eccentric portion 33a that rotates eccentrically with the rotation is formed.

  Between the eccentric part 33 a and the piston 22, a connecting rod 25 that switches the eccentric rotational movement of the eccentric part 33 a to the linear reciprocation of the piston 22 is installed.

  In such a hermetic compressor, the rotating shaft 33 rotates together with the rotor 32 by the electromagnetic interaction between the stator 31 and the rotor 32, and is connected to the eccentric portion 33 a of the rotating shaft 33 via the connecting rod 25. The piston 22 to be moved linearly reciprocates inside the compression chamber 21a.

  When the rotor 32 rotates in this manner, as shown in FIG. 3, centrifugal force A is generated at the eccentric portion 33 a and the connecting rod 25 around the rotation shaft 33, and inertial force B is generated at the connecting rod 25 and the piston 22. To do.

  In order to compensate for the eccentric rotation of the rotary shaft 33 by the forces A and B during the rotation of the rotor 32, a lower weight balance 45 is installed at the lower portion of the rotor 32.

  However, the centrifugal force F generated by the lower weight balance 45 does not work on the same axis as the forces A and B, and generates a moment with respect to the reference axis O.

  In order to compensate for the moment generated by the installation of the lower weight balance 45 in this manner, the upper weight balance 40 is installed on the upper side of the rotor 32 in the direction opposite to the lower weight balance 45 around the rotation shaft 33. . Since the upper weight balance 40 is further away from the reference axis O than the lower weight balance 45, the moment generated by the lower weight balance 45 can be compensated even with a weight smaller than the lower weight balance 45.

  Here, the upper weight balance 40 and the lower weight balance 45 are installed on the rotor 32 so as to be separated from the upper surface and the lower surface of the rotor 32, respectively.

  FIG. 4 shows a rivet 50 for fixing the weight balances 40 and 45 to the rotor 32 so that the upper weight balance 40 and the lower weight balance 45 are installed separately from the upper and lower surfaces of the rotor 32. Show.

  As shown in FIG. 4, the rivet 50 that fixes the weight balances 40 and 45 to the rotor 32 has a separating member 55 that is in close contact with the rotor 32 at one end and in close contact with the weight balances 40 and 45 at the other end. Such a separating member 55 is not located at the same distance from the both ends of the rivet 50 but is biased to one end.

  Accordingly, the rivet 50 includes a first through portion 51 that extends long from the separating member 55 and penetrates the rotor 32, and a second through portion 52 that extends short from the separating member 55 and penetrates the weight balances 40 and 45. Further, holes 50a are formed at both ends of the rivet 50 so as to enable caulking work.

  When the upper weight balance 40 is fixed to the rotor 32, the first through portion 51 is penetrated from the upper portion of the rotor 32 through the through hole 32 a formed in the rotor 32, and then the first penetration is made at the lower portion of the rotor 32. The end portion of the portion 51 is caulked using a jig, and the second through portion 52 is penetrated from the lower portion of the upper weight balance 40 through the through hole 40a formed in the upper weight balance 40. The end of the second penetrating portion 52 is caulked using a jig.

  When the lower weight balance 45 is fixed to the rotor 32, it is fixed in the same manner as when the upper weight balance 40 is fixed to the rotor 32.

  When the upper weight balance 40 and the lower weight balance 45 are fixed to the rotor 32 by using the rivets 50 according to the above-described embodiments, the upper weight balance 40 and the lower weight balance 45 are separated from the separation member 55 as shown in FIG. It is set apart from the rotor 32 by a height H.

  Since the lower weight balance 45 is thus separated from the lower surface of the rotor 32, the distance L4 from the reference axis O to the lower weight balance 45 is shorter than in the prior art. The moment generated from installation is reduced. At this time, the weight of the lower weight balance 45 can also be reduced.

  On the other hand, since the upper weight balance 40 is installed apart from the upper surface of the rotor 32, the distance L3 from the reference axis O to the upper weight balance 40 increases as compared with the conventional case.

  Since the moment generated from the installation of the lower weight balance 45 has decreased, the moment generated from the installation of the upper weight balance 40 has to be reduced accordingly, but the distance L3 from the reference axis O to the upper weight balance 40 is also Due to the increase, the weight of the upper weight balance 40 must be reduced.

  Thus, the weight of the weight balances 40 and 45 can be reduced by installing the upper weight balance 40 and the lower weight balance 45 separately from the rotor.

  FIG. 5 is a view showing another embodiment of the rivet 50 for installing the weight balances 40, 45 apart from the rotor 32.

  The separation member 55 of the rivet 50 according to another embodiment includes two locking protrusions 55a and 55b formed so that the weight balances 40 and 45 have a distance H separated from the rotor 32.

FIG. 6 is a view showing still another embodiment in which the weight balance is coupled to the rotor.
As shown in FIG. 6, the separation member 50 that separates the upper weight balance 40 and the lower weight balance 45 from the rotor 32 by a predetermined distance is formed integrally with the weight balances 40 and 45.

  The separation member 60 is formed to protrude at a predetermined height on either the upper surface or the lower surface of the weight balances 40 and 45. In this case, it is preferable that the separating member 60 has a thickness that can withstand the fastening force of the rivet when the rivet is fastened, and the weight thereof is minimized.

  When the weight balances 40 and 45 having such a separation member 60 are installed on the rotor 32, as shown in FIG. 7, a rivet 50 having a locking projection 50b formed only at one end may be used.

  When the weight balances 40 and 45 are installed using the rivet 50 shown in FIG. 7, the rivet 50 simultaneously connects the through holes 32 a formed in the rotor 32 and the through holes 40 a and 45 a formed in the weight balances 40 and 45. After passing, the end portion where the locking projection 50b is not formed may be caulked using a jig. In this way, since only one end of the rivet 50 needs to be coked, the coking work is reduced.

  In FIG. 6, the example in which the separation member is formed integrally with the weight balance has been described. However, the separation member is not limited to being formed integrally with the weight balance, and is manufactured separately from the weight balance. It may be inserted between the weight balance and the rotor.

It is sectional drawing which shows the rotor with which the weight balance was couple | bonded in the conventional hermetic compressor. It is sectional drawing which shows the hermetic compressor by this invention. It is a perspective view which shows a mode that the weight balance was couple | bonded with the rotor of the hermetic compressor shown in FIG. It is a perspective view which shows the rivet for fixing the weight balance of FIG. 3 to a rotor. It is a perspective view which shows the other Example of the rivet for fixing the weight balance of FIG. 3 to a rotor. It is a perspective view which shows a mode that the weight balance was couple | bonded with the rotor of the hermetic compressor shown in FIG. 2 by another Example. It is a perspective view which shows the rivet for fixing the weight balance of FIG. 6 to a rotor.

Explanation of symbols

22 Piston 25 Connecting rod 32 Rotor 33 Rotating shaft 33a Eccentric portion 40 Upper weight balance 45 Lower weight balance 50 Rivet 55, 60 Separation member

Claims (8)

A stator,
A rotor that rotates in electrical interaction with the stator;
A rotating shaft that is press-fitted into the rotor and rotates with the rotor;
An eccentric portion formed at one end of the rotating shaft so as to be eccentrically rotated according to the rotation of the rotating shaft;
A plurality of weight balances installed on the rotor to prevent the rotating shaft from rotating eccentrically by the eccentric portion;
A separating member for separating the plurality of weight balances from the rotor;
A hermetic compressor, comprising:   2. The hermetic compressor according to claim 1, further comprising a rivet for fixing the plurality of weight balances to the rotor, and the separating member is formed integrally with the rivet. The hermetic compressor as described.   The hermetic compressor according to claim 2, wherein the separating member has a predetermined height so that the rotating member and each weight balance are separated from each other.   The separation member according to claim 2, wherein the separation member includes a plurality of locking protrusions provided at a predetermined distance from each other such that the rotation member and each weight balance are separated from each other. Hermetic compressor.   The rivet includes a first penetrating portion extending from one side of the spacing member and penetrating the rotor, and a second penetrating portion extending from the other side of the spacing member and penetrating each weight balance. The hermetic compressor according to claim 2, wherein   6. The hermetic compressor according to claim 5, wherein the weight balance is fixed to the rotor by caulking both end portions of the rivet.   2. The hermetic compressor according to claim 1, wherein the separation member is formed to protrude a predetermined height from either the upper surface or the lower surface of each weight balance.   2. The hermetic compressor according to claim 1, wherein the weight of the weight balance provided far from the eccentric portion is smaller than the weight of the weight balance provided near the eccentric portion.

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